Spells
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Implemented
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- Fireball (kills tree tiles)
- Lightning (kills scorpions)

Not implemented yet
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- Waterball (kills rock tiles)
- Rockball (kills metal tiles)

Ideas for new spells
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- Shove moveblock (when a moveblock covers a hole, the hole can be crossed)
- Generate moveblock (produces a moveable block on a special tile)
- Freeze water (turns water into ice -- slippery!)
- Dry water (turns water into soil -- not slipper, but more costly)
- Jump over tile (leaps over any tile. expensive!)
